fix: --target lib/wc should overwrite user entry/output

fix #1072

packages/@vue/cli-service/lib/commands/build/entry-lib.js

@@ -1,3 +1,14 @@
-import Component from '~entry'
+;(function () {
+  if (typeof window !== 'undefined') {
+    let i
+    if ((i = window.document.currentScript) && (i = i.src.match(/(.+\/)[^/]+\.js$/))) {
+      __webpack_public_path__ = i[1] // eslint-disable-line
+    }
+  } else {
+    __webpack_public_path__ = '/' // eslint-disable-line
+  }
+})()
 
-export default Component
+import mod from '~entry'
+export default mod
+export * from '~entry'

packages/@vue/cli-service/lib/commands/build/resolveLibConfig.js

@@ -14,31 +14,6 @@ module.exports = (api, { entry, name }, options) => {
   function genConfig (format, postfix = format, genHTML) {
     const config = api.resolveChainableWebpackConfig()
 
-    config.entryPoints.clear()
-    const entryName = `${libName}.${postfix}`
-    // set proxy entry for *.vue files
-    if (/\.vue$/.test(entry)) {
-      config
-        .entry(entryName)
-          .add(require.resolve('./entry-lib.js'))
-      config.resolve
-        .alias
-          .set('~entry', api.resolve(entry))
-    } else {
-      config
-        .entry(entryName)
-          .add(api.resolve(entry))
-    }
-
-    config.output
-      .filename(`${entryName}.js`)
-      .chunkFilename(`${entryName}.[id].js`)
-      .library(libName)
-      .libraryExport('default')
-      .libraryTarget(format)
-      // use relative publicPath so this can be deployed anywhere
-      .publicPath('./')
-
     // adjust css output name so they write to the same file
     if (options.css.extract !== false) {
       config
@@ -76,7 +51,32 @@ module.exports = (api, { entry, name }, options) => {
           }])
     }
 
-    return api.resolveWebpackConfig(config)
+    // resolve entry/output
+    const entryName = `${libName}.${postfix}`
+    config.resolve
+      .alias
+        .set('~entry', api.resolve(entry))
+
+    // set entry/output after user configureWebpack hooks are applied
+    const rawConfig = api.resolveWebpackConfig(config)
+
+    rawConfig.entry = {
+      [entryName]: require.resolve('./entry-lib.js')
+    }
+
+    Object.assign(rawConfig.output, {
+      filename: `${entryName}.js`,
+      chunkFilename: `${entryName}.[id].js`,
+      library: libName,
+      libraryExport: 'default',
+      libraryTarget: format,
+      // use dynamic publicPath so this can be deployed anywhere
+      // the actual path will be determined at runtime by checking
+      // document.currentScript.src.
+      publicPath: ''
+    })
+
+    return rawConfig
   }
 
   return [

packages/@vue/cli-service/lib/commands/build/resolveWcConfig.js

@@ -43,17 +43,6 @@ module.exports = (api, { target, entry, name }) => {
   function genConfig (minify, genHTML) {
     const config = api.resolveChainableWebpackConfig()
 
-    config.entryPoints.clear()
-    const entryName = `${libName}${minify ? `.min` : ``}`
-
-    // set proxy entry for *.vue files
-    config
-      .entry(entryName)
-        .add(dynamicEntry)
-    config.resolve
-      .alias
-        .set('~root', api.resolve('.'))
-
     // make sure not to transpile wc-wrapper
     config.module
       .rule('js')
@@ -65,14 +54,6 @@ module.exports = (api, { target, entry, name }) => {
       config.plugins.delete('uglify')
     }
 
-    config.output
-      .filename(`${entryName}.js`)
-      .chunkFilename(`${libName}.[id]${minify ? `.min` : ``}.js`)
-      // use dynamic publicPath so this can be deployed anywhere
-      // the actual path will be determined at runtime by checking
-      // document.currentScript.src.
-      .publicPath('')
-
     // externalize Vue in case user imports it
     config
       .externals({
@@ -110,7 +91,31 @@ module.exports = (api, { target, entry, name }) => {
           }])
     }
 
-    return api.resolveWebpackConfig(config)
+    // set entry/output last so it takes higher priority than user
+    // configureWebpack hooks
+
+    // set proxy entry for *.vue files
+    config.resolve
+      .alias
+        .set('~root', api.resolve('.'))
+
+    const rawConfig = api.resolveWebpackConfig(config)
+
+    const entryName = `${libName}${minify ? `.min` : ``}`
+    rawConfig.entry = {
+      [entryName]: dynamicEntry
+    }
+
+    Object.assign(rawConfig.output, {
+      filename: `${entryName}.js`,
+      chunkFilename: `${libName}.[id]${minify ? `.min` : ``}.js`,
+      // use dynamic publicPath so this can be deployed anywhere
+      // the actual path will be determined at runtime by checking
+      // document.currentScript.src.
+      publicPath: ''
+    })
+
+    return rawConfig
   }
 
   return [